George K. Stillman (1821 - January 25, 1891) was an American engraver. Born in Massachusetts, Stillman lived in Ohio from the late 1840s and resided in Cincinnati until his death. He served in the Union Army during the American Civil War in Company D of the 137th Regiment of the Ohio Infantry. He served from May 2, 1864 through August 19, 1864. He married Mary Nottingham on February 9, 1846, with whom he had three children.